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Mazyrski [523]
3 years ago
5

you push a box across the floor with a force of 30n you it 15 meters in 8 seconds. how much work did you do how much power did y

ou see
Physics
2 answers:
Naddika [18.5K]3 years ago
7 0
20m/s newtons per second 


Vadim26 [7]3 years ago
3 0

Answer : W = 450 J and P =  56.25 Watts

Explanation :

It is given that,

Force, F = 30 N

Distance, d = 15 m

Time, t = 8 sec

The work done is given as :

W = F.d

W=30\ N\times 15\ m

W = 450\ J

So, the work done to push a box across the floor is 450 N.

Mechanical power is defined as,

P=\dfrac{Work}{time}

P=\dfrac{450\ J}{8\ s}

P = 56.25 Watt

The power is 56.25 Watts.

Hence, this is the required solution.

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a car is moving down the street at 55km/h. a child suddenly runs into the street. If it takes the driver 0.75 seconds to react a
Lelechka [254]
11.46 meters

55 km/h = ? m/s
55 km/h × 1000 (meters per km) = 55,000 m/h
55,000 m/h ÷ 3,600 (seconds in an hour) = 15.28 m/s
15.28 m/s × 0.75 s = 11.46 m
3 0
4 years ago
7. Why are cooking pans made of aluminum? {Explain using the specific heat value of
Dimas [21]
Cooking utensils, such as pots, pans and menu trays, are often made from aluminium because it is lightweight and conducts heat well, making it energy-efficient for heating and cooling. These properties also make it a preferred material for packaging.
6 0
2 years ago
The most likely place to find abundant manganese nodules is on the: a. abyssal plain far from a continent. b. continental rise.
Zigmanuir [339]

Answer:

a. abyssal plain far from a continent

Explanation:

  • The sediments of the abyssal plains contain of the abundant mineral resources and notably polymetallic nodules and re also called the manganese nodules and these are on the shape of potatoes and distributed at the depths of about 4000 meters.  
  • <u>And they lie at the international line of the pacific oceans stretching in an area of 118°–157°, and from 9°–16°N, that is 3 million m square is currently under the noddle exploration and discovery.</u>
8 0
4 years ago
Light enters a transparent material from air at 30.0° to the normal. It continues within the material at the angle of refraction
nikdorinn [45]

Answer:

The value is c = 51.38 ^o

Explanation:

From the question we are told that

    The angle of incidence is  \theta_i = 30^o

    The angle of refraction is  \theta_r  =  23^o

     

Generally at the point where the light enters the material ,  from Snell's law  we have that

          n  =  \frac{sin (\theta_i)}{sin (\theta_{r})}

Here  n is the refractive index of the material

=>       n  =  \frac{sin (30)}{sin (23)}  

=>       n  =  1.28  

Generally for total internal  reflection , the critical angel is evaluated using Snell law as follows

          n  =  \frac{sin (90)}{sin (c)}

=>       1.28 *  sin (c)  =  sin(90)  

=>      c =  sin^{-1} [0.7813 ]

=>    c = 51.38 ^o

8 0
3 years ago
What is the lift (in newtons) due to Bernoulli's principle on a wing of area 87 m2 if the air passes over the top and bottom sur
german

Answer:

Explanation:

According to Bernoulli's principle

P₁ + 1/2ρ v₁² + ρgh₁ = P₂ + 1/2ρ v₂² + ρgh₂  , ρ is density of air . P₁ , P₂ are pressures at two surfaces .

h₁ = h₂

P₁ - P₂ =  1/2ρ( v₂² -   v₁² ) = Lift pressure

ρ of air = 1.225 kg / m³

P₁ - P₂ =  1/2ρ( v₂² -   v₁² )

= .5 x 1.225 ( 260² - 170² )

=  .5 x 1.225 ( 67600- 28900 )

= 23703.75 N/m²

Lift Force = pressure x area

= 23703.75 x 87

= 2062226.25 N .

6 0
3 years ago
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